At the time, a fan tweeted: “Kylie Jenner is most definitely having a girl. She has been posting so much pink stuff."

Kylie posted a throwback snap of her pink hair in November (Image: Kylie Jenner/Instagram)

Kylie also posted a photo of her pink nails (Image: Kylie Jenner/Instagram)

Now fans believe the pink theme was in reference to Kim and Kanye’s new baby girl.

One fan tweeted: “I totally think that Kylie is the surrogate to Kim's baby. Kim is having a baby girl...everything Kylie was hinting to was the color pink.”

Another added: “Low key Kylie is the surrogate for Kim’s baby girl that’s why she would post things with pink on IG.”

And one said: “So rumours say Kylie was in labour around the weekend, pink clues in baby shower pics, then Kim's surrogate has their baby yesterday!!? Seriously? Kylie is the surrogate. It's too coincidental.”